JPH0869597A - Monitoring device using motion vector detection means - Google Patents

Abstract

PURPOSE: To provide the monitor device which gives less burden to a transmission line and doesn't require any standard materials or the like. CONSTITUTION: In a monitor unit 1, an input picture 12 from an image input means 11 is used to output a motion vector 14 and an inter-frame difference value 16 from a motion vector generation means 13 and a difference means 15. The motion vector 14 and the inter-frame difference value 16 are encoded by an encoding means 17 and are outputted as an encoded output 2. The encoded output 2 is sent to a decoding means 31 in an analysis unit 4 through a transmission line 3, and a motion vector 32 and an inter-frame difference value 33 are decoded. The form, the size, and the motion vector of the moving object are detected in a detection means 34 based on the decoded motion vector 32 and inter-frame difference value 33 and are outputted to an analysis means 35. The analysis means 35 generates a monitor result 5 from the form, the size, and the motion vector of the moving object.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for monitoring the movement of an object such as a traffic monitoring device.

[0002]

2. Description of the Related Art Conventionally, as a monitoring device, a method of transmitting an image of a monitoring place and monitoring or recording it by a person has been used.

In addition, there is a device for monitoring the traffic volume based on the degree of concealment of a standard article, such as Japanese Patent Laid-Open No. 4-340700, particularly when monitoring the traffic volume.

[0004]

However, in the conventional monitoring device, the monitoring image is transmitted to the transmission path through which the monitor image is transmitted.
There is a problem in that a large burden is required to send the image.

Further, in order to detect the movement required for traffic volume monitoring, it is necessary to install a standard object such as a marker and detect the movement according to the degree of hiding.

SUMMARY OF THE INVENTION It is an object of the present invention to eliminate the above problems and provide a monitoring device that has a light transmission line load and does not require a standard product.

[0007]

A monitoring device according to the present invention comprises at least one or more monitoring units and an analysis unit for receiving and analyzing coded signals from the monitoring units to obtain a monitoring result. Generates an inter-frame difference value between the motion vector and the input image from the image input by the image input means, encodes it by the encoding means, and outputs it. The analysis unit has a configuration in which the coded signal is decoded by the decoding means, the motion vector and the inter-frame difference value are taken out, the analysis processing is performed, the size and speed of the object are detected, and the monitoring result is obtained.

In addition, the encoding processing in the monitoring unit is MP
It is also possible to obtain the motion vector and the difference between frames by performing the image band compression processing of EG2 and the decompression processing by the analysis unit.

[0009]

The monitoring apparatus of the present invention can reduce the load on the transmission line by compressing the band and transmitting the information such as the motion vector and the interframe difference value, and the motion vector and the frame generated by the monitoring unit. Since the analysis processing is performed using the inter-difference value, the analysis can be easily performed.

Further, since the motion vector and the inter-frame difference data are used in MPEG2, the MPEG2 image band compression process is applied to the encoding process in the monitoring unit, so that the transmission of the image itself at the installation place of the monitoring unit also burdens the transmission path. It can be performed without increasing the size, and the image can be easily stored.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The monitoring device of the present invention will be described by taking traffic monitoring as an example.

FIG. 1 is a block diagram of an embodiment of the monitoring apparatus of the present invention, in which an encoded output 2 from the monitoring unit 1 is input to an analysis unit 4 through a transmission line 3. In the analysis unit 4, the encoded output 2 is decoded and analyzed, and the monitoring result 5 is obtained.

Next, the structure of the monitoring unit 1 will be described. The image to be monitored is captured by the image input means 11 and output as the input image 12 for each frame. The motion vector generation means 13 compares the input image 12 and the input image one frame before stored in the motion vector generation means for each block of n × n pixels, and generates a motion vector 14.
At this time, if the evaluation function value for obtaining the motion vector exceeds a certain threshold value, the motion vector 14 is not generated.

The difference means 15 obtains an inter-frame difference value 16 from the input image 12, the motion vector 14, and the input image one frame before stored in the difference means 15. When the motion vector 14 does not exist, the difference means 15 does not perform the difference and outputs n × n pixels of the input image 12.

Next, the analysis unit 4 will be described. The encoded output 2 sent through the transmission line 3 is the decoding means 31.
Is input to and decoded into the motion vector 32 and the inter-frame difference value 33.

Motion vector 32 and interframe difference value 33
Is input to the detection means 34 and detects the number, size, and speed of moving objects.

The outline of the processing in the detecting means 34 will be described with reference to FIG. The current frame input image 201 is the moving object 20.
2 and a stationary object 203. The motion vector 32 corresponding to the search block 204 having the size of n × n indicates,
The part to be referred to in the input image 205 one frame before is the corresponding block 206.

When the detection means 34 classifies each block by the presence / absence of a difference value and the motion vector value to form one frame, a difference value frame 207 is formed.

The moving object 202 is represented as a block 208 having substantially the same motion vector as the moving object 202 moves. Further, the portion hidden by the moving object 202 is indicated by a block 209 having data that is not a difference. Further, the rest does not change between frames (motion vector 0, difference value 0 block 210), that is, the background.

From the difference value frame 207, the moving object 20
2 the size on the screen is known, and the movement speed is 3
It will be possible to determine in 2.

Therefore, in the detecting means 34, the moving object 20
The size and shape of 2 and the motion vector thereof are detected and sent to the analyzing means 35, and the analyzing means 35 can calculate the size and type of the actual moving object and the moving speed to know the traffic volume, and thereby monitor. Generates result 5.

FIG. 3 shows a second embodiment of the present invention, MP.
1 shows a configuration of a traffic volume monitoring device using an EG2 image band compression / expansion system.

In the monitoring unit 301, the image input means 321 sends the image input 322 to the MPEG2 image band compression means 323 and encodes it by the MPEG2 compression method to obtain the encoded output 302.

The encoded output 302 is sent to the switch means 307 through the transmission line 303. Similarly, the encoded output 305 from the monitoring unit 304 is input to the switch means 307 through the transmission line 306.

The switch means 307 has three inputs and one output, and its output is sent to the analysis unit 308 and the storage means 309.

In the analysis unit 308, the switch means 3
The encoded signal output from 07 is expanded in the MPEG2 image band expansion means 331, and the image signal 311
The motion vector 332 and the inter-frame difference value 333 are obtained.
The motion vector 332 and the interframe difference value 333 are sent to the detection unit 334, and the detection unit 334 outputs the size and shape of the moving object and the motion vector to the analysis unit 335. The analysis unit 335 can calculate the actual size and type of the moving object and the moving speed to know the traffic volume, and thus generate the monitoring result 310. The processing in the detection means 334 is the same as the processing in the first embodiment, so the description thereof will be omitted.

The image signal 311 is sent to the image display means 31.
2, and the image is displayed. The storage unit 309 is
The output of the switch unit 307 is accumulated, and the accumulated encoded signal is output to the switch unit 307 as necessary.

The switch means 307 is the monitoring unit 301.
The coded outputs 302 and 305 output from the and 304 and the output from the storage unit 309 are switched by the control signal 313 and output.

[0029]

According to the monitoring device of the present invention, the load on the transmission line can be reduced by transmitting the information such as the motion vector and the interframe difference value by band-compressing the input image, and the monitoring unit can be used. Since the analysis processing is performed using the motion vector and the inter-frame difference value generated in step 3, the analysis can be easily performed. Further, by using the motion vector, a standard object or the like becomes unnecessary when detecting the speed.

Furthermore, the MPEG2 image band compression / expansion system is used to perform MPE for the encoding processing in the monitoring unit.
By performing the G2 image band compression process, the transmission of the image itself at the monitoring unit installation location can be performed without increasing the load on the transmission path, and the capacity for storing the image can be reduced.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a monitoring device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing an outline of processing by a detection means 34.

FIG. 3 is a configuration diagram of a monitoring device according to a second embodiment of the present invention.

[Explanation of symbols]

 1 Monitoring Unit 2 Encoding Output 4 Analyzing Unit 5 Monitoring Result 11 Image Input Means 13 Motion Vector Generating Means 15 Difference Means 17 Encoding Means 31 Decoding Means 34 Detecting Means 35 Analyzing Means 301, 304 Analyzing Units 307 Switching Means 308 Analyzing Units 309 storage means 312 image display means 313 control signal 323 MPEG2 image band compression means 331 MPEG2 image band expansion means

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Claims (3)

[Claims] 1. A monitor unit comprising at least one monitor unit and an analysis unit for receiving a coded signal from the monitor unit and analyzing the coded signal to obtain a monitor result. The monitor unit includes an image input means for inputting an image.
Motion detection means for generating a motion vector for the input image, difference means for generating an inter-frame difference value of the input image based on the motion vector, quantization of the motion vector and the inter-frame difference value, a code The analysis unit has a decoding unit that decodes the output sent from the monitoring unit, and the motion vector and the inter-frame difference value decoded by the decoding unit 2. A monitoring device, comprising: a detection unit that detects the size and speed of the detection unit; and an analysis unit that analyzes the detection result of the detection unit to obtain a monitoring result. 2. A monitor unit comprising at least one monitor unit and an analysis unit for receiving a signal from the monitor unit and analyzing the signal to obtain a monitor result. The monitor unit includes image input means for inputting an image and the image input unit. MPEG2 image band compression means for encoding and outputting an image, said analysis unit, and MPEG2 image band expansion means for decoding the encoded output sent from said monitoring unit,
A detection unit for detecting the size and speed of the object from the motion vector and the inter-frame difference value decoded by the MPEG2 image band expansion unit; and an analysis unit for analyzing the detection result of the detection unit to obtain a monitoring result. A monitoring device characterized by having. 3. A means for accumulating the coded output from the monitoring unit, and an image display means for inputting the coded signal accumulated when necessary to the MPEG2 image band expanding means in the analysis unit for decoding and displaying an image. The monitoring device according to claim 2, further comprising: